diff --git a/apps/sim/tools/index.ts b/apps/sim/tools/index.ts
index 4061ecf1e..34c242b3d 100644
--- a/apps/sim/tools/index.ts
+++ b/apps/sim/tools/index.ts
@@ -766,6 +766,7 @@ function validateClientSideParams(
   // Internal parameters that should be excluded from validation
   const internalParamSet = new Set([
     '_context',
+    '_toolSchema',
     'workflowId',
     'envVars',
     'workflowVariables',